//talkback.c --演示与用户进行交互
#include<stdio.h>
#include<string.h> //提供strlen()函数的原型
#define DENSITY 62.4//人体密度
int main(void)
{
    float weight,volume;
    int size,letters;
    char name[40];  //name 是一个可以容纳40的字符的数组

    printf("Hi! What's your first name?\n");
    scanf("%s",name);
    printf("%s,what's your weight in pounds?\n",name);
    scanf("%f",&weight);
    size=sizeof name;
    letters=strlen(name);
    volume=weight/DENSITY;
    printf("Well,%s,your volume is %2.2f cubic feet.\n",name,volume);
    printf("Also,your first name has %d letters,\n",letters);
    printf("and we have %d bytes to store it.\n",size);

    return 0;


    
}